Still really tiny, you shouldn't have to have it that small. Have you read this?
https://www.gardenpondforum.com/introductions-announcements.html
I just browse to the picture on my lappy, click upload and the picture shows in the thread.
This is a small snap of this screen, see the paper clip? try using that option, find your photo and upload it.
If you are replying to a thread it is under go advanced. Hope this helps.